I live in a city and as obviously, there are lot of vehicles emitting the polluted gases. I actually find morning air more refreshing than the evening air, when i go outside during these two times.
What is the reason behind it?
Another Question :- Does sunlight play a role in reducing air...
In Apollo 13 the space shuttle had to hit the atmosphere at just the right angle in order to avoid bouncing off of it. Why is it that a man-made satellite can fall to earth and manage to penetrate the atmosphere without a problem but for a space shuttle its more complicated?
If the Earth had no atmosphere, what would be the period of a satellite skimming just above the Earth's surface?
Can anyone help me answering this question with explaination?